As a Denver newbie I haven't been many places yet, but Zengo's one of the few I've hit, and had some of the same dishes as you. I thought the ceviche was a little weak--a little too much coconut-milkiness and not enough anything else--but I was quite surprised at the excellence of that foie gras dish.

My husband and I love Zengo. We have only been once (it's quite expensive, which for us translates to a very special occasion). For the main course, we shared Braised Short Ribs and Wok Seared Tuna. Both were excellent. We also had the chocolate bombe for dessert---very good, as were the mojitos.